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Page Title: Table 7-4. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued
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TM 32-5895-227-14&P
Table 74. Troubleshooting Radio Intercept Control Switchboard SB-2602/G - Continued
Item
Trouble symptom
Probable trouble
Corrective action
number
Defective MON OFF switch SW32
Check for electrical continuity and
14
First special intercom
proper operation of MON OFF switch
operator cannot
monitor any
outstation on all
tion on all channels.
Lack of 20 Vdc to MON OFF switch
With MON OFF switch SW32 in the
SW32
open position, check for presence of 20
Vdc across common terminals of switch.
If 20 Vdc is not present, check continuity
of circuit.
Defective relays K1 through K10
Transfer outstation to the special
15
Special intercom
corresponding to inoperative channel
intercom operator via SB-2601/G and
operator is unable to
selection.
SB-2602/G special monitor channel,
talk to individual
depress SPEC ICOM switch SW62 and
station being
check for presence of 20 Vdc at relay
monitored.
coils K1 through K10. If 20 Vdc is
present and relay is not energized, relay
is defective. Remove and replace relay.
16
Special intercom
Defective magnetically-held type SPEC
Transfer outstation to the operator
operator is unable
ICOM switch SW62
through the special intercom SB-2601/G
to talk to the
and nonfunctioning SB-2602/G special
particular station
monitor channel. Depress magnetically-
being monitored
held type SPEC ICOM switch SW62 and
(all channels).
check for presence of 20 Vdc at switch
SW62 holding coil. If 20 Vdc is present
and coil is not energized, switch is
defective. Remove and replace switch.
Defective relay K42
Transfer outstation to the special
intercom operator. Depress SPEC
ICOM switch SW62 and check for
presence of 20 Vdc at relay coil K42. If
20 Vdc is present and relay is not
energized, relay is defective. Remove
and replace relay.
NOTE
Troubleshooting for the second special intercom circuit will be the same as for the first special
intercom, since both circuits are identical; however, switch and relay numbers will differ.
17
Special intercom
Defective MON OFF switch SW62
With any one of the following SPEC
operator is unable to
(supplies 20 Vdc to holding coils of
MON switches SW63, SW64, or SW65
monitor the third,
magnetically held type special monitor
held in the closed position, check for
fourth, and fifth
switches SW63, SW64, and SW65).
presence of 20 Vdc at holding coil of the
special intercom
activated SPEC MON switch. If 20 Vdc
stations.
is not present, MON OFF switch SW62
is defective. Remove and replace
switch.
7-14

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